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A. Schild (AS) Calibre 1221 Watch Spare Parts: Technical Overview and Sourcing Guide

A. Schild (AS) Calibre 1221 is a vintage Swiss manual-wind mechanical movement recognized for its reliable construction, classic design, and sweeping central seconds function. It is popular among watchmakers and collectors restoring mid-20th century timepieces.
Key Technical Highlights

Calibre: AS 1221

Movement Type: Manual wind, mechanical

Diameter: Approximately 25.6 mm (11.5 lignes)

Height: About 4.02 mm

Jewels: 17 synthetic ruby jewels

Beat Rate: 18,000 vibrations per hour (vph)

Power Reserve: Typically around 34-40 hours

Functions: Hours, minutes, sweeping central seconds

Shock Protection: Usually minimal or none, requiring careful handling

Winding Mechanism: Traditional manual yoke system

Special Features: Balanced construction with nickel screw balance and counterclockwise hairspring

Common Spare Parts and Maintenance Components

Mainspring and Barrel: Essential for power transmission; mainsprings often fatigue or break with age and must be replaced with exact fit parts.

Balance Wheel and Balance Staff: Critical parts impacting accuracy; vulnerable to shock damage, requiring original or precisely matched replacements.

Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing authentic or compatible parts is key for smooth operation.

Gear Train Wheels: Minute, third, and fourth wheels may suffer wear or damage; donor movements or new-old stock (NOS) parts are commonly used.

Stem, Crown, and Setting Mechanism: Wear with use and require precise fitting replacements to ensure reliable winding and time-setting.

Jewels: Ruby bearings reduce friction; replacement jewels must match the specific count and placement for this caliber.

Hands and Dial: Period-correct hands and dials maintain authenticity, often sourced from vintage stocks or specialists.

Sourcing and Service Tips

Donor Movements: Non-working AS 1221 movements are valuable for obtaining rare parts like balance assemblies and wheels.

Original and NOS Parts: It is advisable to procure parts identified explicitly for AS 1221 to guarantee compatibility and maintain movement integrity.

Handling: With minimal shock protection, components especially balance and escapement must be handled gently during servicing.

Lubrication: Use modern synthetic oils sparingly, respecting vintage watch lubrication standards.

Identification: The calibre number is generally stamped on the main plate or under the balance cock for accurate part ordering.

Why AS 1221 Spare Parts Matter

Reliability and Precision: Using authentic parts preserves the notable accuracy and durability of the AS 1221 movement.

Collector Appeal: Correct restoration with original or compatible components maintains both historical value and proper functionality of vintage watches.

Watchmaker Familiarity: AS 1221 is well-known in vintage watch servicing, supporting easier repair and parts sourcing compared to rarer calibers.

The A. Schild AS 1221 stands as a fine example of mid-20th century Swiss manual movements. Access to quality spare parts is essential to keep these mechanical timepieces working reliably and authentically for years to come.